// This code is in the public domain -- castanyo@yahoo.es

#ifndef NV_MESH_MESHTOPOLOGY_H
#define NV_MESH_MESHTOPOLOGY_H

#include <nvmesh/nvmesh.h>

namespace nv
{
	namespace HalfEdge { class Mesh; }
	class MeshAdjacency;

	/// Mesh topology information.
	class MeshTopology
	{
	public:
		MeshTopology(const HalfEdge::Mesh * mesh) { buildTopologyInfo(mesh); }
		
		/// Determine if the mesh is connected.
		bool isConnected() const { return m_connectedCount == 1; }
		
		/// Determine if the mesh is closed. (Each edge is shared by two faces)
		bool isClosed() const { return m_boundaryCount == 0; }
		
		/// Return true if the mesh has the topology of a disk.
		bool isDisk() const { return isConnected() && m_boundaryCount == 1/* && m_eulerNumber == 1*/; }
		
		/// Return the number of connected components.
		int connectedCount() const { return m_connectedCount; }
		
		/// Return the number of open holes.
		int holeCount() const { return m_boundaryCount; }
		
		/// Return the genus of the mesh.
		int genus() const { return m_genus; }
		
		/// Return the euler number of the mesh.
		int euler() const { return m_eulerNumber; }


		static bool isQuadOnly(const HalfEdge::Mesh * mesh);


	private:
		
		NVMESH_API void buildTopologyInfo(const HalfEdge::Mesh * mesh);
		
	private:
		
		///< Number of boundary loops.
		int m_boundaryCount;		
		
		///< Number of connected components.
		int m_connectedCount;		

		///< Euler number.
		int m_eulerNumber;
		
		/// Mesh genus.
		int m_genus;
	};

} // nv namespace

#endif // NV_MESH_MESHTOPOLOGY_H
